Determination of framework concentrations of gallium in [Ga]-ZSM-5
1989; Elsevier BV; Volume: 54; Issue: 1 Linguagem: Inglês
10.1016/s0166-9834(00)82363-5
ISSN1873-3867
AutoresT. J. Gricus Kofke, Raymond J. Gorte, G. T. Kokotailo,
Tópico(s)Crystal Structures and Properties
ResumoThe adsorption of ammonia, 2-propanol, and 2-propanamine on H- [Ga]-ZSM-5 has been examined using temperature-programmed desorption (TPD) and thermogravimetric analysis (TGA). For each of the adsorbates, a clearly defined adsorption complex with a stoichiometry of one per Ga could be identified. For 2-propanol and 2-propanamine, these 1:1 adsorption complexes react to desorb as propene and either water or ammonia. Adsorption complexes were not observed when a high-silica ZSM-5 was impregnated with Ga2O3, implying that the adsorption complexes are associated with the hydroxyls at framework Ga sites in the zeolite and are not observed for Ga which is not in the framework. The results suggest that adsorption can be used to determine the framework concentrations of Ga in H-[Ga]-ZSM-5.
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